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(11) | EP 1 947 632 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Four-color data processing system |
| (57) An organic electro-luminescent display (OELD) device for processing multicolor gray-scale
data, comprises a four-color converting part for converting primary RGB gray-scale
data into compensated RGBW gray-scale data by adding white gray-scale data to the
primary RGB gray-scale data, a data driving part for processing the compensated RGBW
gray-scale data provided from the four-color converting part to generate four-color
signals in an analog type, a scan driving part for generating scan signals in sequence,
and an OELD panel for emitting light with a color in response to the four-color signals
from the data driving part and the scan signals from the scan driving part. The four-color
converting part includes a gamma converting part for converting the primary RGB gray-scale
data, a white extracting part for extracting a white color component from the gamma-converted
RGB data, a data determining part for generating four-color RGBW data by subtracting
the white color component from the gamma-converted RGB data and adding the white gray-scale
data to the gamma-converted RGB data, and a reverse-gamma converting part for reverse-gamma
converting the four-color RGBW data.
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